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Experimental configuration for simultaneous magneto-optical imaging and voltage measurements.
Dendritic avalanches in the NbN film before (a) and after (b), (c) attaching potential leads. The boundary between the metal cover on the left and the bare NbN film on the right is indicated by the dashed line. The length of the black scale bar in (b) is 0.5 mm. The horizontal line in the lower region of (b) and (c) is the edge of the indicator film. The bright features below this line in (c) are artefacts of light reflections from the metal surface, and are independent of the applied magnetic field.
(a) Voltage pulse generated by dendritic avalanche in Fig. 2(b) at temperature of 3.8 K and applied magnetic field of 4.25 mT. The measured pulse is an integral signal from all branches entering into the Cu-coated area. (b) Voltage pulse generated by dendritic avalanche shown in Fig. 2(c) at temperature of 4.5 K and applied magnetic field of 2.25 mT. The numbers in Figs. 2(c) and (b) indicate a suggested correspondence between the different pulses and respective flux branches.
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